WASHER SIZE CHARTS
Complete dimensional specifications for USS, SAE, and metric flat washers — accurate measurements for inner diameter and outer diameter
Precision Washer Sizing Reference
Our comprehensive washer size charts provide exact dimensions for all standard washer types. Whether you need USS (United States Standard), SAE (Society of Automotive Engineers), or metric flat washers, these charts include complete specifications for proper bolt sizing, load distribution, and surface protection.
US Standard Washer Size Charts
Complete dimensions for USS and SAE flat washers with imperial measurements
USS Flat Washers
United States Standard flat washer dimensions including inner diameter (ID) and outer diameter (OD) specifications with wider bearing surfaces for general-purpose applications and superior load distribution.
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SAE Flat Washers
Society of Automotive Engineers flat washer specifications with precise ID and OD measurements. Features narrower profiles than USS washers, ideal for automotive and tight-clearance applications where space is limited.
Download PDF Chart →Metric Washer Size Charts
ISO standard metric flat washer dimensions with DIN specifications
USS vs SAE vs Metric Washers
USS Washers
Larger outer diameter provides maximum bearing surface and load distribution. Best for wood, soft materials, and applications requiring wide contact area. Most common in construction and general manufacturing.
SAE Washers
Smaller outer diameter than USS for tight spaces and automotive use. Narrower profile fits better in confined areas while still providing adequate load distribution. Standard in automotive and machinery applications.
Metric Washers
ISO standardized dimensions following DIN specifications. Form A (standard) and Form B (large) series available. Essential for international projects and equipment requiring metric fasteners and global compatibility.
How to Select the Right Washer
1. Match Bolt Size
Select washer inner diameter (ID) that matches your bolt or screw size for proper fit and alignment.
2. Check Clearance
Ensure outer diameter (OD) fits your application space and provides adequate bearing surface for load distribution.
3. Choose Washer Type
Select USS for wider bearing surfaces in general applications, SAE for tighter spaces, or metric for international standard compatibility.
Need Help Choosing Washers?
Our fastener specialists can recommend the right washer type, size, and material for your specific project requirements.